. value, especially during war, as the aircraft can deter- mine its position without transmitting and thus re- vealing its own presence. It also makes flying possible on cloudy nights when landmarks cannot be seen. The stations to which bearings are taken should obviously not be too close together. During peace-time, and also during war-time, there are always sufficient high-power wireless stations (such as Poldhu in Cornwall and Eiffel Tower in Paris) at work to enable these bearings to be taken. Also, for special flights, special transmission, if necessary, can be easily arranged. For the se
. value, especially during war, as the aircraft can deter- mine its position without transmitting and thus re- vealing its own presence. It also makes flying possible on cloudy nights when landmarks cannot be seen. The stations to which bearings are taken should obviously not be too close together. During peace-time, and also during war-time, there are always sufficient high-power wireless stations (such as Poldhu in Cornwall and Eiffel Tower in Paris) at work to enable these bearings to be taken. Also, for special flights, special transmission, if necessary, can be easily arranged. For the second method no special direction-finding wireless apparatus is necessary in the aircraft. This is installed in the ground stations, and only an ordinary wireless installation is carried in the aircraft. When its position is required, the aircraft X (in Fig. 3) calls up stations Y and Z and asks for its position. Both Y and Z take bearings to the aircraft by means of
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